diff --git a/clang-tools-extra/clang-tidy/llvmlibc/InlineFunctionDeclCheck.cpp b/clang-tools-extra/clang-tidy/llvmlibc/InlineFunctionDeclCheck.cpp
--- a/clang-tools-extra/clang-tidy/llvmlibc/InlineFunctionDeclCheck.cpp
+++ b/clang-tools-extra/clang-tidy/llvmlibc/InlineFunctionDeclCheck.cpp
@@ -39,6 +39,12 @@
                                         HeaderFileExtensions))
     return;
 
+  // Consider only functions with an external and visible declaration.
+  if (const auto *MethodDecl = dyn_cast<CXXMethodDecl>(FuncDecl)) {
+    if (MethodDecl->getParent()->isLambda())
+      return;
+  }
+
   // Check if decl starts with LIBC_INLINE
   auto Loc = FullSourceLoc(Result.SourceManager->getFileLoc(SrcBegin),
                            *Result.SourceManager);
diff --git a/clang-tools-extra/test/clang-tidy/checkers/llvmlibc/inline-function-decl.hpp b/clang-tools-extra/test/clang-tidy/checkers/llvmlibc/inline-function-decl.hpp
--- a/clang-tools-extra/test/clang-tidy/checkers/llvmlibc/inline-function-decl.hpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/llvmlibc/inline-function-decl.hpp
@@ -60,6 +60,14 @@
   }
 };
 
+LIBC_INLINE void lambda() {
+// CHECK-MESSAGES-NOT: :[[@LINE+4]]:3: warning: '__invoke' must be tagged with the LIBC_INLINE macro; the macro should be placed at the beginning of the declaration [llvmlibc-inline-function-decl]
+// CHECK-MESSAGES-NOT: :[[@LINE+3]]:3: warning: 'operator void (*)()' must be tagged with the LIBC_INLINE macro; the macro should be placed at the beginning of the declaration [llvmlibc-inline-function-decl]
+// CHECK-MESSAGES-NOT: :[[@LINE+2]]:3: warning: '~(lambda at [[FILENAME:.+]])' must be tagged with the LIBC_INLINE macro; the macro should be placed at the beginning of the declaration [llvmlibc-inline-function-decl]
+// CHECK-MESSAGES-NOT: :[[@LINE+1]]:6: warning: 'operator()' must be tagged with the LIBC_INLINE macro; the macro should be placed at the beginning of the declaration [llvmlibc-inline-function-decl]
+  [](){};
+}
+
 } // namespace __llvm_libc
 
 #endif // LLVM_CLANG_TOOLS_EXTRA_TEST_CLANG_TIDY_CHECKERS_LLVMLIBC_INLINEFUNCTIONDECL_H